The US Emergency Alert System (EAS) that lets officials instantly interrupt radio and TV broadcasts to provide emergency information in a crisis suffers from security holes that leave it vulnerable to denial of service attacks, and could even permit hackers to issue their own false regional alerts, federal regulators acknowledged Thursday. . . . The US Emergency Alert System (EAS) that lets officials instantly interrupt radio and TV broadcasts to provide emergency information in a crisis suffers from security holes that leave it vulnerable to denial of service attacks, and could even permit hackers to issue their own false regional alerts, federal regulators acknowledged Thursday.